Flush toilet

Abstract

A flush toilet includes a bowl part, a drainage water trap part that is connected to a bottom part of the bowl part, and a water drainage socket that is connected to the drainage water trap part and includes an upper side water drainage socket that extends downward from the drainage water trap part, a back side R part that is connected to the upper side water drainage socket and changes a flow channel so that a washing water that flows from an upper side is directed to a front side, and a horizontal pipe that extends forward from the back side R part. The back side R part and the horizontal pipe include a water storage part that stores a part of washing water. The water storage part is arranged on a lower side of a back side lower end part of the drainage water trap part.

What is claimed is: 
     
       1. A flush toilet, comprising:
 a bowl part that includes a waste-receiving surface with a bowl shape and a rim part that is formed on an upper side of the waste-receiving surface; 
 a water spout part that is provided on the rim part and spouts a washing water toward an inside of the bowl part; 
 a drainage water trap part that is connected to a bottom part of the bowl part and discharges a waste in the bowl part; and 
 a water drainage socket that is provided with an upstream side that is connected to the drainage water trap part and a downstream side that is connected to a water drainage port of a floor surface, provides a flow channel for a washing water that is discharged from the drainage water trap part, and includes an upper side water drainage socket that extends downward from the drainage water trap part, a back side R part that is connected to the upper side water drainage socket and changes a flow channel in such a manner that a washing water that flows from an upper side is directed to a front side, and a horizontal pipe that extends forward from the back side R part, wherein 
 the back side R part and the horizontal pipe include a water storage part that stores a part of a washing water, and 
 the water storage part is arranged on a lower side of a back side lower end part of the drainage water trap part in such a manner that a back end part of the water storage part is arranged at a back side of an extended line that extends downward from the back side lower end part of the drainage water trap part. 
 
     
     
       2. The flush toilet according to  claim 1 , wherein:
 the upper side water drainage socket includes a sloping part that slopes downward and backward from an upstream side to a downstream side; and 
 the back end part of the water storage part is arranged in a vicinity on an extended line from a lower end part of the sloping part. 
 
     
     
       3. A flush toilet, comprising:
 a bowl part that includes a waste-receiving surface with a bowl shape and a rim part that is formed on an upper side of the waste-receiving surface; 
 a water spout part that is provided on the rim part and spouts a washing water toward an inside of the bowl part; 
 a drainage water trap part that is connected to a bottom part of the bowl part and discharges a waste in the bowl part; and 
 a water drainage socket that is provided with an upstream side that is connected to the drainage water trap part and a downstream side that is connected to a water drainage port of a floor surface, provides a flow channel for a washing water that is discharged from the drainage water trap part, and includes an upper side water drainage socket that extends downward from the drainage water trap part, a back side R part that is connected to the upper side water drainage socket and changes a flow channel in such a manner that a washing water that flows from an upper side is directed to a front side, and a horizontal pipe that extends forward from the back side R part, wherein 
 the back side R part and the horizontal pipe include a water storage part that stores a part of a washing water, and 
 the water storage part is arranged on a lower side of a back side lower end part of the drainage water trap part, wherein: 
 the upper side water drainage socket includes a sloping part that slopes downward and backward from an upstream side to a downstream side; and 
 in a side view, an extended line that extends downward from a back side lower end part of the drainage water trap part and an extended line that extends downward from a lower end part of the sloping part along a slope of the sloping part intersect above the water storage part. 
 
     
     
       4. A flush toilet, comprising:
 a bowl part that includes a waste-receiving surface with a bowl shape and a rim part that is formed on an upper side of the waste-receiving surface; 
 a water spout part that is provided on the rim part and spouts a washing water toward an inside of the bowl part; 
 a drainage water trap part that is connected to a bottom part of the bowl part and discharges a waste in the bowl part; and 
 a water drainage socket that is provided with an upstream side that is connected to the drainage water trap part and a downstream side that is connected to a water drainage port of a floor surface, provides a flow channel for a washing water that is discharged from the drainage water trap part, and includes an upper side water drainage socket that extends downward from the drainage water trap part, a back side R part that is connected to the upper side water drainage socket and changes a flow channel in such a manner that a washing water that flows from an upper side is directed to a front side, and a horizontal pipe that extends forward from the back side R part, wherein 
 the back side R part and the horizontal pipe include a water storage part that stores a part of a washing water, and 
 the water storage part is arranged on a lower side of a back side lower end part of the drainage water trap part, wherein: 
 the upper side water drainage socket includes a sloping part that slopes downward and backward from an upstream side to a downstream side; and 
 in a side view, a point of intersection between an extended line that extends downward from a back side lower end part of the drainage water trap part and an extended line that extends downward from a lower end part of the sloping part along a slope of the sloping part is arranged below an upper end part of the horizontal pipe.